Henryk Wieniawski, Henryk also spelled Henri, (born July 10, 1835, Lublin, Pol., Russian Empire [now in Poland]—died March 31, 1880, Moscow, Russia), Polish violinist and composer, one of the most celebrated violinists of the 19th century.

Wieniawski was a child prodigy who entered the Paris Conservatory at age 8 and graduated from there with the first prize in violin at the unprecedented age of 11. He became a concert violinist at age 13 and began touring Europe with his brother Joseph, a pianist. His wide-ranging concert tours brought him international fame. In 1860 he was appointed violin soloist to the tsar of Russia, and from 1862 to 1869 he taught at the St. Petersburg Conservatory. In 1872–74 he toured the United States, playing with the pianist Anton Rubinstein, and he subsequently taught for a time at the Brussels Conservatory.

As a violinist Wieniawski was admired for his rich, warm tone, glowing temperament, and perfect technique. His own compositions for violin are Romantic in style and were intended to display his virtuosity. He composed two violin concerti, one in F-sharp Minor (Opus 14) and a quite popular one in D Minor (Opus 22). His other compositions include Le Carnaval russe (Opus 11), Legende (Opus 17), Scherzo-tarantelle (Opus 16), and études, mazurkas, and polonaises.

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